A sample size of 3 is hardly statistically significant.

From what I could found, billionaires die on average at ~83 years old. ( https://strygin.substack.com/p/how-billionaires-die )

It's not far off what a decent health care system is able to provide in most wealthy countries. It's even somewhat lower actually.

It's difficult to assess the risk factors, but in the end, I have the feeling their additional medical staff and their ability to "cut the queue" (S. Jobs-style) just barely offsets the additional common risk factors (stress, long hours, segregated life), specially if we compare to the upper-middle class.

In the end, there is no magic $100M pill giving you 10 more years. And in truth, access to food, drinking water, a non-toxic environment and really basic healthcare & medicine (vaccines, antibiotics) probably already brings you at a fairly high life expectancy.